Always set the callee's context when calling a function from optimized code.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index d94a1feb238c5e0abef2c1d2f670e30e2c72c6b9..7e138cb260aa570512eeddf29048e6af8a3f5127 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -3193,14 +3193,8 @@ void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
       __ LoadHeapObject(r1, function);
     }
 
-    // Change context if needed.
-    bool change_context =
-        (info()->closure()->context() != function->context()) ||
-        scope()->contains_with() ||
-        (scope()->num_heap_slots() > 0);
-    if (change_context) {
-      __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
-    }
+    // Change context.
+    __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
 
     // Set r0 to arguments count if adaption is not needed. Assumes that r0
     // is available to write to at this point.